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A safe implementation of the transactional outbox pattern for Java (core library)

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package com.gruelbox.transactionoutbox;

import java.sql.Connection;

/**
 * Source for JDBC connections to be provided to a {@link TransactionManager}. It is not required
 * for a {@link TransactionManager} to use {@link ConnectionProvider}, and when integrating with
 * existing applications with transaction management, it is indeed unlikely to do so.
 */
@SuppressWarnings("WeakerAccess")
public interface ConnectionProvider {

  /**
   * Requests a new connection, or an available connection from a pool. The caller is responsible
   * for calling {@link Connection#close()}.
   *
   * @return The connection.
   */
  Connection obtainConnection();
}